Was the water cold enough?
Make sure you use very cold water for carbonation. Coldwater (from the refrigerator) holds carbonation much better than cold water from the tap.
Did you carbonate long enough?
Flat soda or water may indicate that you have not appropriately carbonated.
After twisting the carbonating bottle into place, press the carbonating button-down in firm short bursts. You will hear a hissing sound at first. Continue to press the button in firm short bursts until they hear a LOUD BUZZ. The loud buzz indicates the first level of carbonation. Three loud buzzes will achieve average carbonation.
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